| /* |
| * Copyright (c) 1996, 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package java.awt; |
| |
| import java.awt.RenderingHints.Key; |
| import java.awt.geom.AffineTransform; |
| import java.awt.image.ImageObserver; |
| import java.awt.image.BufferedImageOp; |
| import java.awt.image.BufferedImage; |
| import java.awt.image.RenderedImage; |
| import java.awt.image.renderable.RenderableImage; |
| import java.awt.font.GlyphVector; |
| import java.awt.font.FontRenderContext; |
| import java.awt.font.TextAttribute; |
| import java.text.AttributedCharacterIterator; |
| import java.util.Map; |
| |
| /** |
| * This {@code Graphics2D} class extends the |
| * {@link Graphics} class to provide more sophisticated |
| * control over geometry, coordinate transformations, color management, |
| * and text layout. This is the fundamental class for rendering |
| * 2-dimensional shapes, text and images on the Java(tm) platform. |
| * |
| * <h2>Coordinate Spaces</h2> |
| * All coordinates passed to a {@code Graphics2D} object are specified |
| * in a device-independent coordinate system called User Space, which is |
| * used by applications. The {@code Graphics2D} object contains |
| * an {@link AffineTransform} object as part of its rendering state |
| * that defines how to convert coordinates from user space to |
| * device-dependent coordinates in Device Space. |
| * <p> |
| * Coordinates in device space usually refer to individual device pixels |
| * and are aligned on the infinitely thin gaps between these pixels. |
| * Some {@code Graphics2D} objects can be used to capture rendering |
| * operations for storage into a graphics metafile for playback on a |
| * concrete device of unknown physical resolution at a later time. Since |
| * the resolution might not be known when the rendering operations are |
| * captured, the {@code Graphics2D Transform} is set up |
| * to transform user coordinates to a virtual device space that |
| * approximates the expected resolution of the target device. Further |
| * transformations might need to be applied at playback time if the |
| * estimate is incorrect. |
| * <p> |
| * Some of the operations performed by the rendering attribute objects |
| * occur in the device space, but all {@code Graphics2D} methods take |
| * user space coordinates. |
| * <p> |
| * Every {@code Graphics2D} object is associated with a target that |
| * defines where rendering takes place. A |
| * {@link GraphicsConfiguration} object defines the characteristics |
| * of the rendering target, such as pixel format and resolution. |
| * The same rendering target is used throughout the life of a |
| * {@code Graphics2D} object. |
| * <p> |
| * When creating a {@code Graphics2D} object, the |
| * {@code GraphicsConfiguration} |
| * specifies the <a id="deftransform">default transform</a> for |
| * the target of the {@code Graphics2D} (a |
| * {@link Component} or {@link Image}). This default transform maps the |
| * user space coordinate system to screen and printer device coordinates |
| * such that the origin maps to the upper left hand corner of the |
| * target region of the device with increasing X coordinates extending |
| * to the right and increasing Y coordinates extending downward. |
| * The scaling of the default transform is set to identity for those devices |
| * that are close to 72 dpi, such as screen devices. |
| * The scaling of the default transform is set to approximately 72 user |
| * space coordinates per square inch for high resolution devices, such as |
| * printers. For image buffers, the default transform is the |
| * {@code Identity} transform. |
| * |
| * <h2>Rendering Process</h2> |
| * The Rendering Process can be broken down into four phases that are |
| * controlled by the {@code Graphics2D} rendering attributes. |
| * The renderer can optimize many of these steps, either by caching the |
| * results for future calls, by collapsing multiple virtual steps into |
| * a single operation, or by recognizing various attributes as common |
| * simple cases that can be eliminated by modifying other parts of the |
| * operation. |
| * <p> |
| * The steps in the rendering process are: |
| * <ol> |
| * <li> |
| * Determine what to render. |
| * <li> |
| * Constrain the rendering operation to the current {@code Clip}. |
| * The {@code Clip} is specified by a {@link Shape} in user |
| * space and is controlled by the program using the various clip |
| * manipulation methods of {@code Graphics} and |
| * {@code Graphics2D}. This <i>user clip</i> |
| * is transformed into device space by the current |
| * {@code Transform} and combined with the |
| * <i>device clip</i>, which is defined by the visibility of windows and |
| * device extents. The combination of the user clip and device clip |
| * defines the <i>composite clip</i>, which determines the final clipping |
| * region. The user clip is not modified by the rendering |
| * system to reflect the resulting composite clip. |
| * <li> |
| * Determine what colors to render. |
| * <li> |
| * Apply the colors to the destination drawing surface using the current |
| * {@link Composite} attribute in the {@code Graphics2D} context. |
| * </ol> |
| * <br> |
| * The three types of rendering operations, along with details of each |
| * of their particular rendering processes are: |
| * <ol> |
| * <li> |
| * <b><a id="rendershape">{@code Shape} operations</a></b> |
| * <ol> |
| * <li> |
| * If the operation is a {@code draw(Shape)} operation, then |
| * the {@link Stroke#createStrokedShape(Shape) createStrokedShape} |
| * method on the current {@link Stroke} attribute in the |
| * {@code Graphics2D} context is used to construct a new |
| * {@code Shape} object that contains the outline of the specified |
| * {@code Shape}. |
| * <li> |
| * The {@code Shape} is transformed from user space to device space |
| * using the current {@code Transform} |
| * in the {@code Graphics2D} context. |
| * <li> |
| * The outline of the {@code Shape} is extracted using the |
| * {@link Shape#getPathIterator(AffineTransform) getPathIterator} method of |
| * {@code Shape}, which returns a |
| * {@link java.awt.geom.PathIterator PathIterator} |
| * object that iterates along the boundary of the {@code Shape}. |
| * <li> |
| * If the {@code Graphics2D} object cannot handle the curved segments |
| * that the {@code PathIterator} object returns then it can call the |
| * alternate |
| * {@link Shape#getPathIterator(AffineTransform, double) getPathIterator} |
| * method of {@code Shape}, which flattens the {@code Shape}. |
| * <li> |
| * The current {@link Paint} in the {@code Graphics2D} context |
| * is queried for a {@link PaintContext}, which specifies the |
| * colors to render in device space. |
| * </ol> |
| * <li> |
| * <b><a id=rendertext>Text operations</a></b> |
| * <ol> |
| * <li> |
| * The following steps are used to determine the set of glyphs required |
| * to render the indicated {@code String}: |
| * <ol> |
| * <li> |
| * If the argument is a {@code String}, then the current |
| * {@code Font} in the {@code Graphics2D} context is asked to |
| * convert the Unicode characters in the {@code String} into a set of |
| * glyphs for presentation with whatever basic layout and shaping |
| * algorithms the font implements. |
| * <li> |
| * If the argument is an |
| * {@link AttributedCharacterIterator}, |
| * the iterator is asked to convert itself to a |
| * {@link java.awt.font.TextLayout TextLayout} |
| * using its embedded font attributes. The {@code TextLayout} |
| * implements more sophisticated glyph layout algorithms that |
| * perform Unicode bi-directional layout adjustments automatically |
| * for multiple fonts of differing writing directions. |
| * <li> |
| * If the argument is a |
| * {@link GlyphVector}, then the |
| * {@code GlyphVector} object already contains the appropriate |
| * font-specific glyph codes with explicit coordinates for the position of |
| * each glyph. |
| * </ol> |
| * <li> |
| * The current {@code Font} is queried to obtain outlines for the |
| * indicated glyphs. These outlines are treated as shapes in user space |
| * relative to the position of each glyph that was determined in step 1. |
| * <li> |
| * The character outlines are filled as indicated above |
| * under <a href="#rendershape">{@code Shape} operations</a>. |
| * <li> |
| * The current {@code Paint} is queried for a |
| * {@code PaintContext}, which specifies |
| * the colors to render in device space. |
| * </ol> |
| * <li> |
| * <b><a id= renderingimage>{@code Image} Operations</a></b> |
| * <ol> |
| * <li> |
| * The region of interest is defined by the bounding box of the source |
| * {@code Image}. |
| * This bounding box is specified in Image Space, which is the |
| * {@code Image} object's local coordinate system. |
| * <li> |
| * If an {@code AffineTransform} is passed to |
| * {@link #drawImage(java.awt.Image, java.awt.geom.AffineTransform, java.awt.image.ImageObserver) drawImage(Image, AffineTransform, ImageObserver)}, |
| * the {@code AffineTransform} is used to transform the bounding |
| * box from image space to user space. If no {@code AffineTransform} |
| * is supplied, the bounding box is treated as if it is already in user space. |
| * <li> |
| * The bounding box of the source {@code Image} is transformed from user |
| * space into device space using the current {@code Transform}. |
| * Note that the result of transforming the bounding box does not |
| * necessarily result in a rectangular region in device space. |
| * <li> |
| * The {@code Image} object determines what colors to render, |
| * sampled according to the source to destination |
| * coordinate mapping specified by the current {@code Transform} and the |
| * optional image transform. |
| * </ol> |
| * </ol> |
| * |
| * <h2>Default Rendering Attributes</h2> |
| * The default values for the {@code Graphics2D} rendering attributes are: |
| * <dl> |
| * <dt><i>{@code Paint}</i> |
| * <dd>The color of the {@code Component}. |
| * <dt><i>{@code Font}</i> |
| * <dd>The {@code Font} of the {@code Component}. |
| * <dt><i>{@code Stroke}</i> |
| * <dd>A square pen with a linewidth of 1, no dashing, miter segment joins |
| * and square end caps. |
| * <dt><i>{@code Transform}</i> |
| * <dd>The |
| * {@link GraphicsConfiguration#getDefaultTransform() getDefaultTransform} |
| * for the {@code GraphicsConfiguration} of the {@code Component}. |
| * <dt><i>{@code Composite}</i> |
| * <dd>The {@link AlphaComposite#SRC_OVER} rule. |
| * <dt><i>{@code Clip}</i> |
| * <dd>No rendering {@code Clip}, the output is clipped to the |
| * {@code Component}. |
| * </dl> |
| * |
| * <h2>Rendering Compatibility Issues</h2> |
| * The JDK(tm) 1.1 rendering model is based on a pixelization model |
| * that specifies that coordinates |
| * are infinitely thin, lying between the pixels. Drawing operations are |
| * performed using a one-pixel wide pen that fills the |
| * pixel below and to the right of the anchor point on the path. |
| * The JDK 1.1 rendering model is consistent with the |
| * capabilities of most of the existing class of platform |
| * renderers that need to resolve integer coordinates to a |
| * discrete pen that must fall completely on a specified number of pixels. |
| * <p> |
| * The Java 2D(tm) (Java(tm) 2 platform) API supports antialiasing renderers. |
| * A pen with a width of one pixel does not need to fall |
| * completely on pixel N as opposed to pixel N+1. The pen can fall |
| * partially on both pixels. It is not necessary to choose a bias |
| * direction for a wide pen since the blending that occurs along the |
| * pen traversal edges makes the sub-pixel position of the pen |
| * visible to the user. On the other hand, when antialiasing is |
| * turned off by setting the |
| * {@link RenderingHints#KEY_ANTIALIASING KEY_ANTIALIASING} hint key |
| * to the |
| * {@link RenderingHints#VALUE_ANTIALIAS_OFF VALUE_ANTIALIAS_OFF} |
| * hint value, the renderer might need |
| * to apply a bias to determine which pixel to modify when the pen |
| * is straddling a pixel boundary, such as when it is drawn |
| * along an integer coordinate in device space. While the capabilities |
| * of an antialiasing renderer make it no longer necessary for the |
| * rendering model to specify a bias for the pen, it is desirable for the |
| * antialiasing and non-antialiasing renderers to perform similarly for |
| * the common cases of drawing one-pixel wide horizontal and vertical |
| * lines on the screen. To ensure that turning on antialiasing by |
| * setting the |
| * {@link RenderingHints#KEY_ANTIALIASING KEY_ANTIALIASING} hint |
| * key to |
| * {@link RenderingHints#VALUE_ANTIALIAS_ON VALUE_ANTIALIAS_ON} |
| * does not cause such lines to suddenly become twice as wide and half |
| * as opaque, it is desirable to have the model specify a path for such |
| * lines so that they completely cover a particular set of pixels to help |
| * increase their crispness. |
| * <p> |
| * Java 2D API maintains compatibility with JDK 1.1 rendering |
| * behavior, such that legacy operations and existing renderer |
| * behavior is unchanged under Java 2D API. Legacy |
| * methods that map onto general {@code draw} and |
| * {@code fill} methods are defined, which clearly indicates |
| * how {@code Graphics2D} extends {@code Graphics} based |
| * on settings of {@code Stroke} and {@code Transform} |
| * attributes and rendering hints. The definition |
| * performs identically under default attribute settings. |
| * For example, the default {@code Stroke} is a |
| * {@code BasicStroke} with a width of 1 and no dashing and the |
| * default Transform for screen drawing is an Identity transform. |
| * <p> |
| * The following two rules provide predictable rendering behavior whether |
| * aliasing or antialiasing is being used. |
| * <ul> |
| * <li> Device coordinates are defined to be between device pixels which |
| * avoids any inconsistent results between aliased and antialiased |
| * rendering. If coordinates were defined to be at a pixel's center, some |
| * of the pixels covered by a shape, such as a rectangle, would only be |
| * half covered. |
| * With aliased rendering, the half covered pixels would either be |
| * rendered inside the shape or outside the shape. With anti-aliased |
| * rendering, the pixels on the entire edge of the shape would be half |
| * covered. On the other hand, since coordinates are defined to be |
| * between pixels, a shape like a rectangle would have no half covered |
| * pixels, whether or not it is rendered using antialiasing. |
| * <li> Lines and paths stroked using the {@code BasicStroke} |
| * object may be "normalized" to provide consistent rendering of the |
| * outlines when positioned at various points on the drawable and |
| * whether drawn with aliased or antialiased rendering. This |
| * normalization process is controlled by the |
| * {@link RenderingHints#KEY_STROKE_CONTROL KEY_STROKE_CONTROL} hint. |
| * The exact normalization algorithm is not specified, but the goals |
| * of this normalization are to ensure that lines are rendered with |
| * consistent visual appearance regardless of how they fall on the |
| * pixel grid and to promote more solid horizontal and vertical |
| * lines in antialiased mode so that they resemble their non-antialiased |
| * counterparts more closely. A typical normalization step might |
| * promote antialiased line endpoints to pixel centers to reduce the |
| * amount of blending or adjust the subpixel positioning of |
| * non-antialiased lines so that the floating point line widths |
| * round to even or odd pixel counts with equal likelihood. This |
| * process can move endpoints by up to half a pixel (usually towards |
| * positive infinity along both axes) to promote these consistent |
| * results. |
| * </ul> |
| * <p> |
| * The following definitions of general legacy methods |
| * perform identically to previously specified behavior under default |
| * attribute settings: |
| * <ul> |
| * <li> |
| * For {@code fill} operations, including {@code fillRect}, |
| * {@code fillRoundRect}, {@code fillOval}, |
| * {@code fillArc}, {@code fillPolygon}, and |
| * {@code clearRect}, {@link #fill(Shape) fill} can now be called |
| * with the desired {@code Shape}. For example, when filling a |
| * rectangle: |
| * <pre> |
| * fill(new Rectangle(x, y, w, h)); |
| * </pre> |
| * is called. |
| * |
| * <li> |
| * Similarly, for draw operations, including {@code drawLine}, |
| * {@code drawRect}, {@code drawRoundRect}, |
| * {@code drawOval}, {@code drawArc}, {@code drawPolyline}, |
| * and {@code drawPolygon}, {@link #draw(Shape) draw} can now be |
| * called with the desired {@code Shape}. For example, when drawing a |
| * rectangle: |
| * <pre> |
| * draw(new Rectangle(x, y, w, h)); |
| * </pre> |
| * is called. |
| * |
| * <li> |
| * The {@code draw3DRect} and {@code fill3DRect} methods were |
| * implemented in terms of the {@code drawLine} and |
| * {@code fillRect} methods in the {@code Graphics} class which |
| * would predicate their behavior upon the current {@code Stroke} |
| * and {@code Paint} objects in a {@code Graphics2D} context. |
| * This class overrides those implementations with versions that use |
| * the current {@code Color} exclusively, overriding the current |
| * {@code Paint} and which uses {@code fillRect} to describe |
| * the exact same behavior as the preexisting methods regardless of the |
| * setting of the current {@code Stroke}. |
| * </ul> |
| * The {@code Graphics} class defines only the {@code setColor} |
| * method to control the color to be painted. Since the Java 2D API extends |
| * the {@code Color} object to implement the new {@code Paint} |
| * interface, the existing |
| * {@code setColor} method is now a convenience method for setting the |
| * current {@code Paint} attribute to a {@code Color} object. |
| * {@code setColor(c)} is equivalent to {@code setPaint(c)}. |
| * <p> |
| * The {@code Graphics} class defines two methods for controlling |
| * how colors are applied to the destination. |
| * <ol> |
| * <li> |
| * The {@code setPaintMode} method is implemented as a convenience |
| * method to set the default {@code Composite}, equivalent to |
| * {@code setComposite(new AlphaComposite.SrcOver)}. |
| * <li> |
| * The {@code setXORMode(Color xorcolor)} method is implemented |
| * as a convenience method to set a special {@code Composite} object that |
| * ignores the {@code Alpha} components of source colors and sets the |
| * destination color to the value: |
| * <pre> |
| * dstpixel = (PixelOf(srccolor) ^ PixelOf(xorcolor) ^ dstpixel); |
| * </pre> |
| * </ol> |
| * |
| * @author Jim Graham |
| * @see java.awt.RenderingHints |
| */ |
| public abstract class Graphics2D extends Graphics { |
| |
| /** |
| * Constructs a new {@code Graphics2D} object. Since |
| * {@code Graphics2D} is an abstract class, and since it must be |
| * customized by subclasses for different output devices, |
| * {@code Graphics2D} objects cannot be created directly. |
| * Instead, {@code Graphics2D} objects must be obtained from another |
| * {@code Graphics2D} object, created by a |
| * {@code Component}, or obtained from images such as |
| * {@link BufferedImage} objects. |
| * @see java.awt.Component#getGraphics |
| * @see java.awt.Graphics#create |
| */ |
| protected Graphics2D() { |
| } |
| |
| /** |
| * Draws a 3-D highlighted outline of the specified rectangle. |
| * The edges of the rectangle are highlighted so that they |
| * appear to be beveled and lit from the upper left corner. |
| * <p> |
| * The colors used for the highlighting effect are determined |
| * based on the current color. |
| * The resulting rectangle covers an area that is |
| * <code>width + 1</code> pixels wide |
| * by <code>height + 1</code> pixels tall. This method |
| * uses the current {@code Color} exclusively and ignores |
| * the current {@code Paint}. |
| * @param x the x coordinate of the rectangle to be drawn. |
| * @param y the y coordinate of the rectangle to be drawn. |
| * @param width the width of the rectangle to be drawn. |
| * @param height the height of the rectangle to be drawn. |
| * @param raised a boolean that determines whether the rectangle |
| * appears to be raised above the surface |
| * or sunk into the surface. |
| * @see java.awt.Graphics#fill3DRect |
| */ |
| public void draw3DRect(int x, int y, int width, int height, |
| boolean raised) { |
| Paint p = getPaint(); |
| Color c = getColor(); |
| Color brighter = c.brighter(); |
| Color darker = c.darker(); |
| |
| setColor(raised ? brighter : darker); |
| //drawLine(x, y, x, y + height); |
| fillRect(x, y, 1, height + 1); |
| //drawLine(x + 1, y, x + width - 1, y); |
| fillRect(x + 1, y, width - 1, 1); |
| setColor(raised ? darker : brighter); |
| //drawLine(x + 1, y + height, x + width, y + height); |
| fillRect(x + 1, y + height, width, 1); |
| //drawLine(x + width, y, x + width, y + height - 1); |
| fillRect(x + width, y, 1, height); |
| setPaint(p); |
| } |
| |
| /** |
| * Paints a 3-D highlighted rectangle filled with the current color. |
| * The edges of the rectangle are highlighted so that it appears |
| * as if the edges were beveled and lit from the upper left corner. |
| * The colors used for the highlighting effect and for filling are |
| * determined from the current {@code Color}. This method uses |
| * the current {@code Color} exclusively and ignores the current |
| * {@code Paint}. |
| * @param x the x coordinate of the rectangle to be filled. |
| * @param y the y coordinate of the rectangle to be filled. |
| * @param width the width of the rectangle to be filled. |
| * @param height the height of the rectangle to be filled. |
| * @param raised a boolean value that determines whether the |
| * rectangle appears to be raised above the surface |
| * or etched into the surface. |
| * @see java.awt.Graphics#draw3DRect |
| */ |
| public void fill3DRect(int x, int y, int width, int height, |
| boolean raised) { |
| Paint p = getPaint(); |
| Color c = getColor(); |
| Color brighter = c.brighter(); |
| Color darker = c.darker(); |
| |
| if (!raised) { |
| setColor(darker); |
| } else if (p != c) { |
| setColor(c); |
| } |
| fillRect(x+1, y+1, width-2, height-2); |
| setColor(raised ? brighter : darker); |
| //drawLine(x, y, x, y + height - 1); |
| fillRect(x, y, 1, height); |
| //drawLine(x + 1, y, x + width - 2, y); |
| fillRect(x + 1, y, width - 2, 1); |
| setColor(raised ? darker : brighter); |
| //drawLine(x + 1, y + height - 1, x + width - 1, y + height - 1); |
| fillRect(x + 1, y + height - 1, width - 1, 1); |
| //drawLine(x + width - 1, y, x + width - 1, y + height - 2); |
| fillRect(x + width - 1, y, 1, height - 1); |
| setPaint(p); |
| } |
| |
| /** |
| * Strokes the outline of a {@code Shape} using the settings of the |
| * current {@code Graphics2D} context. The rendering attributes |
| * applied include the {@code Clip}, {@code Transform}, |
| * {@code Paint}, {@code Composite} and |
| * {@code Stroke} attributes. |
| * @param s the {@code Shape} to be rendered |
| * @see #setStroke |
| * @see #setPaint |
| * @see java.awt.Graphics#setColor |
| * @see #transform |
| * @see #setTransform |
| * @see #clip |
| * @see #setClip |
| * @see #setComposite |
| */ |
| public abstract void draw(Shape s); |
| |
| /** |
| * Renders an image, applying a transform from image space into user space |
| * before drawing. |
| * The transformation from user space into device space is done with |
| * the current {@code Transform} in the {@code Graphics2D}. |
| * The specified transformation is applied to the image before the |
| * transform attribute in the {@code Graphics2D} context is applied. |
| * The rendering attributes applied include the {@code Clip}, |
| * {@code Transform}, and {@code Composite} attributes. |
| * Note that no rendering is done if the specified transform is |
| * noninvertible. |
| * @param img the specified image to be rendered. |
| * This method does nothing if {@code img} is null. |
| * @param xform the transformation from image space into user space |
| * @param obs the {@link ImageObserver} |
| * to be notified as more of the {@code Image} |
| * is converted |
| * @return {@code true} if the {@code Image} is |
| * fully loaded and completely rendered, or if it's null; |
| * {@code false} if the {@code Image} is still being loaded. |
| * @see #transform |
| * @see #setTransform |
| * @see #setComposite |
| * @see #clip |
| * @see #setClip |
| */ |
| public abstract boolean drawImage(Image img, |
| AffineTransform xform, |
| ImageObserver obs); |
| |
| /** |
| * Renders a {@code BufferedImage} that is |
| * filtered with a |
| * {@link BufferedImageOp}. |
| * The rendering attributes applied include the {@code Clip}, |
| * {@code Transform} |
| * and {@code Composite} attributes. This is equivalent to: |
| * <pre> |
| * img1 = op.filter(img, null); |
| * drawImage(img1, new AffineTransform(1f,0f,0f,1f,x,y), null); |
| * </pre> |
| * @param op the filter to be applied to the image before rendering |
| * @param img the specified {@code BufferedImage} to be rendered. |
| * This method does nothing if {@code img} is null. |
| * @param x the x coordinate of the location in user space where |
| * the upper left corner of the image is rendered |
| * @param y the y coordinate of the location in user space where |
| * the upper left corner of the image is rendered |
| * |
| * @see #transform |
| * @see #setTransform |
| * @see #setComposite |
| * @see #clip |
| * @see #setClip |
| */ |
| public abstract void drawImage(BufferedImage img, |
| BufferedImageOp op, |
| int x, |
| int y); |
| |
| /** |
| * Renders a {@link RenderedImage}, |
| * applying a transform from image |
| * space into user space before drawing. |
| * The transformation from user space into device space is done with |
| * the current {@code Transform} in the {@code Graphics2D}. |
| * The specified transformation is applied to the image before the |
| * transform attribute in the {@code Graphics2D} context is applied. |
| * The rendering attributes applied include the {@code Clip}, |
| * {@code Transform}, and {@code Composite} attributes. Note |
| * that no rendering is done if the specified transform is |
| * noninvertible. |
| * @param img the image to be rendered. This method does |
| * nothing if {@code img} is null. |
| * @param xform the transformation from image space into user space |
| * @see #transform |
| * @see #setTransform |
| * @see #setComposite |
| * @see #clip |
| * @see #setClip |
| */ |
| public abstract void drawRenderedImage(RenderedImage img, |
| AffineTransform xform); |
| |
| /** |
| * Renders a |
| * {@link RenderableImage}, |
| * applying a transform from image space into user space before drawing. |
| * The transformation from user space into device space is done with |
| * the current {@code Transform} in the {@code Graphics2D}. |
| * The specified transformation is applied to the image before the |
| * transform attribute in the {@code Graphics2D} context is applied. |
| * The rendering attributes applied include the {@code Clip}, |
| * {@code Transform}, and {@code Composite} attributes. Note |
| * that no rendering is done if the specified transform is |
| * noninvertible. |
| *<p> |
| * Rendering hints set on the {@code Graphics2D} object might |
| * be used in rendering the {@code RenderableImage}. |
| * If explicit control is required over specific hints recognized by a |
| * specific {@code RenderableImage}, or if knowledge of which hints |
| * are used is required, then a {@code RenderedImage} should be |
| * obtained directly from the {@code RenderableImage} |
| * and rendered using |
| *{@link #drawRenderedImage(RenderedImage, AffineTransform) drawRenderedImage}. |
| * @param img the image to be rendered. This method does |
| * nothing if {@code img} is null. |
| * @param xform the transformation from image space into user space |
| * @see #transform |
| * @see #setTransform |
| * @see #setComposite |
| * @see #clip |
| * @see #setClip |
| * @see #drawRenderedImage |
| */ |
| public abstract void drawRenderableImage(RenderableImage img, |
| AffineTransform xform); |
| |
| /** |
| * Renders the text of the specified {@code String}, using the |
| * current text attribute state in the {@code Graphics2D} context. |
| * The baseline of the |
| * first character is at position (<i>x</i>, <i>y</i>) in |
| * the User Space. |
| * The rendering attributes applied include the {@code Clip}, |
| * {@code Transform}, {@code Paint}, {@code Font} and |
| * {@code Composite} attributes. For characters in script |
| * systems such as Hebrew and Arabic, the glyphs can be rendered from |
| * right to left, in which case the coordinate supplied is the |
| * location of the leftmost character on the baseline. |
| * @param str the string to be rendered |
| * @param x the x coordinate of the location where the |
| * {@code String} should be rendered |
| * @param y the y coordinate of the location where the |
| * {@code String} should be rendered |
| * @throws NullPointerException if {@code str} is |
| * {@code null} |
| * @see java.awt.Graphics#drawBytes |
| * @see java.awt.Graphics#drawChars |
| * @since 1.0 |
| */ |
| public abstract void drawString(String str, int x, int y); |
| |
| /** |
| * Renders the text specified by the specified {@code String}, |
| * using the current text attribute state in the {@code Graphics2D} context. |
| * The baseline of the first character is at position |
| * (<i>x</i>, <i>y</i>) in the User Space. |
| * The rendering attributes applied include the {@code Clip}, |
| * {@code Transform}, {@code Paint}, {@code Font} and |
| * {@code Composite} attributes. For characters in script systems |
| * such as Hebrew and Arabic, the glyphs can be rendered from right to |
| * left, in which case the coordinate supplied is the location of the |
| * leftmost character on the baseline. |
| * @param str the {@code String} to be rendered |
| * @param x the x coordinate of the location where the |
| * {@code String} should be rendered |
| * @param y the y coordinate of the location where the |
| * {@code String} should be rendered |
| * @throws NullPointerException if {@code str} is |
| * {@code null} |
| * @see #setPaint |
| * @see java.awt.Graphics#setColor |
| * @see java.awt.Graphics#setFont |
| * @see #setTransform |
| * @see #setComposite |
| * @see #setClip |
| */ |
| public abstract void drawString(String str, float x, float y); |
| |
| /** |
| * Renders the text of the specified iterator applying its attributes |
| * in accordance with the specification of the {@link TextAttribute} class. |
| * <p> |
| * The baseline of the first character is at position |
| * (<i>x</i>, <i>y</i>) in User Space. |
| * For characters in script systems such as Hebrew and Arabic, |
| * the glyphs can be rendered from right to left, in which case the |
| * coordinate supplied is the location of the leftmost character |
| * on the baseline. |
| * @param iterator the iterator whose text is to be rendered |
| * @param x the x coordinate where the iterator's text is to be |
| * rendered |
| * @param y the y coordinate where the iterator's text is to be |
| * rendered |
| * @throws NullPointerException if {@code iterator} is |
| * {@code null} |
| * @see #setPaint |
| * @see java.awt.Graphics#setColor |
| * @see #setTransform |
| * @see #setComposite |
| * @see #setClip |
| */ |
| public abstract void drawString(AttributedCharacterIterator iterator, |
| int x, int y); |
| |
| /** |
| * Renders the text of the specified iterator applying its attributes |
| * in accordance with the specification of the {@link TextAttribute} class. |
| * <p> |
| * The baseline of the first character is at position |
| * (<i>x</i>, <i>y</i>) in User Space. |
| * For characters in script systems such as Hebrew and Arabic, |
| * the glyphs can be rendered from right to left, in which case the |
| * coordinate supplied is the location of the leftmost character |
| * on the baseline. |
| * @param iterator the iterator whose text is to be rendered |
| * @param x the x coordinate where the iterator's text is to be |
| * rendered |
| * @param y the y coordinate where the iterator's text is to be |
| * rendered |
| * @throws NullPointerException if {@code iterator} is |
| * {@code null} |
| * @see #setPaint |
| * @see java.awt.Graphics#setColor |
| * @see #setTransform |
| * @see #setComposite |
| * @see #setClip |
| */ |
| public abstract void drawString(AttributedCharacterIterator iterator, |
| float x, float y); |
| |
| /** |
| * Renders the text of the specified |
| * {@link GlyphVector} using |
| * the {@code Graphics2D} context's rendering attributes. |
| * The rendering attributes applied include the {@code Clip}, |
| * {@code Transform}, {@code Paint}, and |
| * {@code Composite} attributes. The {@code GlyphVector} |
| * specifies individual glyphs from a {@link Font}. |
| * The {@code GlyphVector} can also contain the glyph positions. |
| * This is the fastest way to render a set of characters to the |
| * screen. |
| * @param g the {@code GlyphVector} to be rendered |
| * @param x the x position in User Space where the glyphs should |
| * be rendered |
| * @param y the y position in User Space where the glyphs should |
| * be rendered |
| * @throws NullPointerException if {@code g} is {@code null}. |
| * |
| * @see java.awt.Font#createGlyphVector |
| * @see java.awt.font.GlyphVector |
| * @see #setPaint |
| * @see java.awt.Graphics#setColor |
| * @see #setTransform |
| * @see #setComposite |
| * @see #setClip |
| */ |
| public abstract void drawGlyphVector(GlyphVector g, float x, float y); |
| |
| /** |
| * Fills the interior of a {@code Shape} using the settings of the |
| * {@code Graphics2D} context. The rendering attributes applied |
| * include the {@code Clip}, {@code Transform}, |
| * {@code Paint}, and {@code Composite}. |
| * @param s the {@code Shape} to be filled |
| * @see #setPaint |
| * @see java.awt.Graphics#setColor |
| * @see #transform |
| * @see #setTransform |
| * @see #setComposite |
| * @see #clip |
| * @see #setClip |
| */ |
| public abstract void fill(Shape s); |
| |
| /** |
| * Checks whether or not the specified {@code Shape} intersects |
| * the specified {@link Rectangle}, which is in device |
| * space. If {@code onStroke} is false, this method checks |
| * whether or not the interior of the specified {@code Shape} |
| * intersects the specified {@code Rectangle}. If |
| * {@code onStroke} is {@code true}, this method checks |
| * whether or not the {@code Stroke} of the specified |
| * {@code Shape} outline intersects the specified |
| * {@code Rectangle}. |
| * The rendering attributes taken into account include the |
| * {@code Clip}, {@code Transform}, and {@code Stroke} |
| * attributes. |
| * @param rect the area in device space to check for a hit |
| * @param s the {@code Shape} to check for a hit |
| * @param onStroke flag used to choose between testing the |
| * stroked or the filled shape. If the flag is {@code true}, the |
| * {@code Stroke} outline is tested. If the flag is |
| * {@code false}, the filled {@code Shape} is tested. |
| * @return {@code true} if there is a hit; {@code false} |
| * otherwise. |
| * @see #setStroke |
| * @see #fill |
| * @see #draw |
| * @see #transform |
| * @see #setTransform |
| * @see #clip |
| * @see #setClip |
| */ |
| public abstract boolean hit(Rectangle rect, |
| Shape s, |
| boolean onStroke); |
| |
| /** |
| * Returns the device configuration associated with this |
| * {@code Graphics2D}. |
| * @return the device configuration of this {@code Graphics2D}. |
| */ |
| public abstract GraphicsConfiguration getDeviceConfiguration(); |
| |
| /** |
| * Sets the {@code Composite} for the {@code Graphics2D} context. |
| * The {@code Composite} is used in all drawing methods such as |
| * {@code drawImage}, {@code drawString}, {@code draw}, |
| * and {@code fill}. It specifies how new pixels are to be combined |
| * with the existing pixels on the graphics device during the rendering |
| * process. |
| * <p>If this {@code Graphics2D} context is drawing to a |
| * {@code Component} on the display screen and the |
| * {@code Composite} is a custom object rather than an |
| * instance of the {@code AlphaComposite} class, and if |
| * there is a security manager, its {@code checkPermission} |
| * method is called with an {@code AWTPermission("readDisplayPixels")} |
| * permission. |
| * @throws SecurityException |
| * if a custom {@code Composite} object is being |
| * used to render to the screen and a security manager |
| * is set and its {@code checkPermission} method |
| * does not allow the operation. |
| * @param comp the {@code Composite} object to be used for rendering |
| * @see java.awt.Graphics#setXORMode |
| * @see java.awt.Graphics#setPaintMode |
| * @see #getComposite |
| * @see AlphaComposite |
| * @see SecurityManager#checkPermission |
| * @see java.awt.AWTPermission |
| */ |
| public abstract void setComposite(Composite comp); |
| |
| /** |
| * Sets the {@code Paint} attribute for the |
| * {@code Graphics2D} context. Calling this method |
| * with a {@code null Paint} object does |
| * not have any effect on the current {@code Paint} attribute |
| * of this {@code Graphics2D}. |
| * @param paint the {@code Paint} object to be used to generate |
| * color during the rendering process, or {@code null} |
| * @see java.awt.Graphics#setColor |
| * @see #getPaint |
| * @see GradientPaint |
| * @see TexturePaint |
| */ |
| public abstract void setPaint( Paint paint ); |
| |
| /** |
| * Sets the {@code Stroke} for the {@code Graphics2D} context. |
| * @param s the {@code Stroke} object to be used to stroke a |
| * {@code Shape} during the rendering process |
| * @see BasicStroke |
| * @see #getStroke |
| */ |
| public abstract void setStroke(Stroke s); |
| |
| /** |
| * Sets the value of a single preference for the rendering algorithms. |
| * Hint categories include controls for rendering quality and overall |
| * time/quality trade-off in the rendering process. Refer to the |
| * {@code RenderingHints} class for definitions of some common |
| * keys and values. |
| * @param hintKey the key of the hint to be set. |
| * @param hintValue the value indicating preferences for the specified |
| * hint category. |
| * @see #getRenderingHint(RenderingHints.Key) |
| * @see RenderingHints |
| */ |
| public abstract void setRenderingHint(Key hintKey, Object hintValue); |
| |
| /** |
| * Returns the value of a single preference for the rendering algorithms. |
| * Hint categories include controls for rendering quality and overall |
| * time/quality trade-off in the rendering process. Refer to the |
| * {@code RenderingHints} class for definitions of some common |
| * keys and values. |
| * @param hintKey the key corresponding to the hint to get. |
| * @return an object representing the value for the specified hint key. |
| * Some of the keys and their associated values are defined in the |
| * {@code RenderingHints} class. |
| * @see RenderingHints |
| * @see #setRenderingHint(RenderingHints.Key, Object) |
| */ |
| public abstract Object getRenderingHint(Key hintKey); |
| |
| /** |
| * Replaces the values of all preferences for the rendering |
| * algorithms with the specified {@code hints}. |
| * The existing values for all rendering hints are discarded and |
| * the new set of known hints and values are initialized from the |
| * specified {@link Map} object. |
| * Hint categories include controls for rendering quality and |
| * overall time/quality trade-off in the rendering process. |
| * Refer to the {@code RenderingHints} class for definitions of |
| * some common keys and values. |
| * @param hints the rendering hints to be set |
| * @see #getRenderingHints |
| * @see RenderingHints |
| */ |
| public abstract void setRenderingHints(Map<?,?> hints); |
| |
| /** |
| * Sets the values of an arbitrary number of preferences for the |
| * rendering algorithms. |
| * Only values for the rendering hints that are present in the |
| * specified {@code Map} object are modified. |
| * All other preferences not present in the specified |
| * object are left unmodified. |
| * Hint categories include controls for rendering quality and |
| * overall time/quality trade-off in the rendering process. |
| * Refer to the {@code RenderingHints} class for definitions of |
| * some common keys and values. |
| * @param hints the rendering hints to be set |
| * @see RenderingHints |
| */ |
| public abstract void addRenderingHints(Map<?,?> hints); |
| |
| /** |
| * Gets the preferences for the rendering algorithms. Hint categories |
| * include controls for rendering quality and overall time/quality |
| * trade-off in the rendering process. |
| * Returns all of the hint key/value pairs that were ever specified in |
| * one operation. Refer to the |
| * {@code RenderingHints} class for definitions of some common |
| * keys and values. |
| * @return a reference to an instance of {@code RenderingHints} |
| * that contains the current preferences. |
| * @see RenderingHints |
| * @see #setRenderingHints(Map) |
| */ |
| public abstract RenderingHints getRenderingHints(); |
| |
| /** |
| * Translates the origin of the {@code Graphics2D} context to the |
| * point (<i>x</i>, <i>y</i>) in the current coordinate system. |
| * Modifies the {@code Graphics2D} context so that its new origin |
| * corresponds to the point (<i>x</i>, <i>y</i>) in the |
| * {@code Graphics2D} context's former coordinate system. All |
| * coordinates used in subsequent rendering operations on this graphics |
| * context are relative to this new origin. |
| * @param x the specified x coordinate |
| * @param y the specified y coordinate |
| * @since 1.0 |
| */ |
| public abstract void translate(int x, int y); |
| |
| /** |
| * Concatenates the current |
| * {@code Graphics2D Transform} |
| * with a translation transform. |
| * Subsequent rendering is translated by the specified |
| * distance relative to the previous position. |
| * This is equivalent to calling transform(T), where T is an |
| * {@code AffineTransform} represented by the following matrix: |
| * <pre> |
| * [ 1 0 tx ] |
| * [ 0 1 ty ] |
| * [ 0 0 1 ] |
| * </pre> |
| * @param tx the distance to translate along the x-axis |
| * @param ty the distance to translate along the y-axis |
| */ |
| public abstract void translate(double tx, double ty); |
| |
| /** |
| * Concatenates the current {@code Graphics2D} |
| * {@code Transform} with a rotation transform. |
| * Subsequent rendering is rotated by the specified radians relative |
| * to the previous origin. |
| * This is equivalent to calling {@code transform(R)}, where R is an |
| * {@code AffineTransform} represented by the following matrix: |
| * <pre> |
| * [ cos(theta) -sin(theta) 0 ] |
| * [ sin(theta) cos(theta) 0 ] |
| * [ 0 0 1 ] |
| * </pre> |
| * Rotating with a positive angle theta rotates points on the positive |
| * x axis toward the positive y axis. |
| * @param theta the angle of rotation in radians |
| */ |
| public abstract void rotate(double theta); |
| |
| /** |
| * Concatenates the current {@code Graphics2D} |
| * {@code Transform} with a translated rotation |
| * transform. Subsequent rendering is transformed by a transform |
| * which is constructed by translating to the specified location, |
| * rotating by the specified radians, and translating back by the same |
| * amount as the original translation. This is equivalent to the |
| * following sequence of calls: |
| * <pre> |
| * translate(x, y); |
| * rotate(theta); |
| * translate(-x, -y); |
| * </pre> |
| * Rotating with a positive angle theta rotates points on the positive |
| * x axis toward the positive y axis. |
| * @param theta the angle of rotation in radians |
| * @param x the x coordinate of the origin of the rotation |
| * @param y the y coordinate of the origin of the rotation |
| */ |
| public abstract void rotate(double theta, double x, double y); |
| |
| /** |
| * Concatenates the current {@code Graphics2D} |
| * {@code Transform} with a scaling transformation |
| * Subsequent rendering is resized according to the specified scaling |
| * factors relative to the previous scaling. |
| * This is equivalent to calling {@code transform(S)}, where S is an |
| * {@code AffineTransform} represented by the following matrix: |
| * <pre> |
| * [ sx 0 0 ] |
| * [ 0 sy 0 ] |
| * [ 0 0 1 ] |
| * </pre> |
| * @param sx the amount by which X coordinates in subsequent |
| * rendering operations are multiplied relative to previous |
| * rendering operations. |
| * @param sy the amount by which Y coordinates in subsequent |
| * rendering operations are multiplied relative to previous |
| * rendering operations. |
| */ |
| public abstract void scale(double sx, double sy); |
| |
| /** |
| * Concatenates the current {@code Graphics2D} |
| * {@code Transform} with a shearing transform. |
| * Subsequent renderings are sheared by the specified |
| * multiplier relative to the previous position. |
| * This is equivalent to calling {@code transform(SH)}, where SH |
| * is an {@code AffineTransform} represented by the following |
| * matrix: |
| * <pre> |
| * [ 1 shx 0 ] |
| * [ shy 1 0 ] |
| * [ 0 0 1 ] |
| * </pre> |
| * @param shx the multiplier by which coordinates are shifted in |
| * the positive X axis direction as a function of their Y coordinate |
| * @param shy the multiplier by which coordinates are shifted in |
| * the positive Y axis direction as a function of their X coordinate |
| */ |
| public abstract void shear(double shx, double shy); |
| |
| /** |
| * Composes an {@code AffineTransform} object with the |
| * {@code Transform} in this {@code Graphics2D} according |
| * to the rule last-specified-first-applied. If the current |
| * {@code Transform} is Cx, the result of composition |
| * with Tx is a new {@code Transform} Cx'. Cx' becomes the |
| * current {@code Transform} for this {@code Graphics2D}. |
| * Transforming a point p by the updated {@code Transform} Cx' is |
| * equivalent to first transforming p by Tx and then transforming |
| * the result by the original {@code Transform} Cx. In other |
| * words, Cx'(p) = Cx(Tx(p)). A copy of the Tx is made, if necessary, |
| * so further modifications to Tx do not affect rendering. |
| * @param Tx the {@code AffineTransform} object to be composed with |
| * the current {@code Transform} |
| * @see #setTransform |
| * @see AffineTransform |
| */ |
| public abstract void transform(AffineTransform Tx); |
| |
| /** |
| * Overwrites the Transform in the {@code Graphics2D} context. |
| * WARNING: This method should <b>never</b> be used to apply a new |
| * coordinate transform on top of an existing transform because the |
| * {@code Graphics2D} might already have a transform that is |
| * needed for other purposes, such as rendering Swing |
| * components or applying a scaling transformation to adjust for the |
| * resolution of a printer. |
| * <p>To add a coordinate transform, use the |
| * {@code transform}, {@code rotate}, {@code scale}, |
| * or {@code shear} methods. The {@code setTransform} |
| * method is intended only for restoring the original |
| * {@code Graphics2D} transform after rendering, as shown in this |
| * example: |
| * <pre> |
| * // Get the current transform |
| * AffineTransform saveAT = g2.getTransform(); |
| * // Perform transformation |
| * g2d.transform(...); |
| * // Render |
| * g2d.draw(...); |
| * // Restore original transform |
| * g2d.setTransform(saveAT); |
| * </pre> |
| * |
| * @param Tx the {@code AffineTransform} that was retrieved |
| * from the {@code getTransform} method |
| * @see #transform |
| * @see #getTransform |
| * @see AffineTransform |
| */ |
| public abstract void setTransform(AffineTransform Tx); |
| |
| /** |
| * Returns a copy of the current {@code Transform} in the |
| * {@code Graphics2D} context. |
| * @return the current {@code AffineTransform} in the |
| * {@code Graphics2D} context. |
| * @see #transform |
| * @see #setTransform |
| */ |
| public abstract AffineTransform getTransform(); |
| |
| /** |
| * Returns the current {@code Paint} of the |
| * {@code Graphics2D} context. |
| * @return the current {@code Graphics2D Paint}, |
| * which defines a color or pattern. |
| * @see #setPaint |
| * @see java.awt.Graphics#setColor |
| */ |
| public abstract Paint getPaint(); |
| |
| /** |
| * Returns the current {@code Composite} in the |
| * {@code Graphics2D} context. |
| * @return the current {@code Graphics2D Composite}, |
| * which defines a compositing style. |
| * @see #setComposite |
| */ |
| public abstract Composite getComposite(); |
| |
| /** |
| * Sets the background color for the {@code Graphics2D} context. |
| * The background color is used for clearing a region. |
| * When a {@code Graphics2D} is constructed for a |
| * {@code Component}, the background color is |
| * inherited from the {@code Component}. Setting the background color |
| * in the {@code Graphics2D} context only affects the subsequent |
| * {@code clearRect} calls and not the background color of the |
| * {@code Component}. To change the background |
| * of the {@code Component}, use appropriate methods of |
| * the {@code Component}. |
| * @param color the background color that is used in |
| * subsequent calls to {@code clearRect} |
| * @see #getBackground |
| * @see java.awt.Graphics#clearRect |
| */ |
| public abstract void setBackground(Color color); |
| |
| /** |
| * Returns the background color used for clearing a region. |
| * @return the current {@code Graphics2D Color}, |
| * which defines the background color. |
| * @see #setBackground |
| */ |
| public abstract Color getBackground(); |
| |
| /** |
| * Returns the current {@code Stroke} in the |
| * {@code Graphics2D} context. |
| * @return the current {@code Graphics2D Stroke}, |
| * which defines the line style. |
| * @see #setStroke |
| */ |
| public abstract Stroke getStroke(); |
| |
| /** |
| * Intersects the current {@code Clip} with the interior of the |
| * specified {@code Shape} and sets the {@code Clip} to the |
| * resulting intersection. The specified {@code Shape} is |
| * transformed with the current {@code Graphics2D} |
| * {@code Transform} before being intersected with the current |
| * {@code Clip}. This method is used to make the current |
| * {@code Clip} smaller. |
| * To make the {@code Clip} larger, use {@code setClip}. |
| * The <i>user clip</i> modified by this method is independent of the |
| * clipping associated with device bounds and visibility. If no clip has |
| * previously been set, or if the clip has been cleared using |
| * {@link Graphics#setClip(Shape) setClip} with a {@code null} |
| * argument, the specified {@code Shape} becomes the new |
| * user clip. |
| * @param s the {@code Shape} to be intersected with the current |
| * {@code Clip}. If {@code s} is {@code null}, |
| * this method clears the current {@code Clip}. |
| */ |
| public abstract void clip(Shape s); |
| |
| /** |
| * Get the rendering context of the {@code Font} within this |
| * {@code Graphics2D} context. |
| * The {@link FontRenderContext} |
| * encapsulates application hints such as anti-aliasing and |
| * fractional metrics, as well as target device specific information |
| * such as dots-per-inch. This information should be provided by the |
| * application when using objects that perform typographical |
| * formatting, such as {@code Font} and |
| * {@code TextLayout}. This information should also be provided |
| * by applications that perform their own layout and need accurate |
| * measurements of various characteristics of glyphs such as advance |
| * and line height when various rendering hints have been applied to |
| * the text rendering. |
| * |
| * @return a reference to an instance of FontRenderContext. |
| * @see java.awt.font.FontRenderContext |
| * @see java.awt.Font#createGlyphVector |
| * @see java.awt.font.TextLayout |
| * @since 1.2 |
| */ |
| |
| public abstract FontRenderContext getFontRenderContext(); |
| |
| } |
